Death Toll In Greek Wildfires Rises To 74

Wildfires sweeping through a Greek resort town have killed at least 74 people including families with children found clasped in a last embrace as they tried to flee the flames.

The inferno was by far Greece's worst since fires devastated the southern Peloponnese peninsula in August 2007, killing dozens. Officials said it broke out in Mati, east of Athens, late on Monday afternoon and was broadly contained by Tuesday afternoon though still burning in some areas, with the risk of reigniting in scrubland parched by Greece's searing summer heat.

"Greece is going through an unspeakable tragedy," Prime Minister Alexis Tsipras said as he appeared on television to declare three days of national mourning.

Emergency crews found the bodies of 26 victims, some of them youngsters, lying close together near the top of a cliff overlooking a beach. They had ended up there after apparently searching for an escape route.

"The Australian Embassy in Athens has confirmed with local authorities that no Australians are known to be affected by forest fires near Athens at this time," a spokesperson for DFAT said. "The Embassy continues to monitor the situation closely."

Many hours after the blaze broke out, the strong smell of charred buildings and trees lingered in the air in parts of Mati on Tuesday. White smoke rose from smouldering fires.

Residents, their faces blackened by smoke, wandered the streets, some searching for their burned-out cars, others for their pets. The eerie silence was punctured by fire-fighting helicopters and the chatter of rescue crews.

Many in the area were unable to escape the fast pace of the blaze even though they were a few metres from the Aegean Sea or in their homes, the fire service said.

"We went into the sea because the flames were chasing us all the way to the water. It burned our backs and we dove into the water," said Kostas Laganos, a survivor.

He compared the ordeal to the destruction of the city of Pompeii, where thousands were incinerated by the volcano of Mount Vesuvius in 79 AD: "I said my God, we must run to save ourselves and nothing else."

Working through the night, coastguard vessels and other boats rescued almost 700 people who had managed to get to the shoreline and pulled another 19 survivors and six dead bodies from the sea, the coastguard said.

It was not clear how many people remained unaccounted for as boats combed beaches for any remaining survivors, with military hospitals on full alert, the Greek government spokesman said.

One of the youngest victims was believed to be a six-month-old baby who died of smoke inhalation, officials said. At least 187 people were injured, among those 23 children.